APPAREIL PHOTOGRAPHIQUE A REGLAGE AUTOMATIQUE DE LA VITESSE DESFILMS

摘要

1314610 Cameras and cassettes therefor POLAROID CORP 19 Nov 1970 [19 Nov 1969] 55098/70 Heading G2A The invention disclosed is similar to that of Specification 1314609 except that the temperatureresponsive impedance is replaced by a tape 60 of predetermined impedance fixed in a recess in the cassette wall. The resistance of the part of the tape between the contacts 62 and 64 on the spring member 66 is related to a sensitometric property of the film, e.g. speed. The value of the resistance can be varied by trimming its width. Its form may be modified, e.g. by having different discrete conductive and resistive paths, and by having these paths in wave patterns.